New 1975 245 DL Rough Idle and Hesitates

Old 03-08-2019, 07:51 PM
Junior Member
Thread Starter
Join Date: Mar 2019
Posts: 1
Default New 1975 245 DL Rough Idle and Hesitates

Hello everyone! My name is Johnny and my girlfriend just purchased an original 1975 245 DL. It has a few issues and Iím new to this fuel injection system so I thought Iíd ask for some assistance. It has a hard time cold starting, once itís warmed up itís instant. Then a little bit of a rough idle, but the biggest issue is the hesitation when trying to take off. At low speeds it hesitates but you can put it to the floor and once it catches up it goes. I suspect that the fuel is old and needs to be draining then refilled with fresh new fuel. Anyways, just trying to get some ideas on what might be wrong. Thanks!!
Old 03-08-2019, 09:06 PM
Former Moderator
Join Date: Oct 2010
Location: 37 North on the left coast
Posts: 9,995

beautiful early 240!

that car has an early FI system called CIS also known as KE-Jetronics or just K-Jet for short. sadly not many people left are familiar with it, Volvo switched to LH electronic injection circa 1983.

stumbling off idle can be caused by air leaks in the intake system, such as the seals around the injectors where they plug into the intake manifold. bad starting can be caused by a non-functioning cold start injector, if that version has one, some just had a pressure booster thing on a thermoswitch that runs for a few seconds at start, I forget what its called. also, erratic idle can be caused by a flakey idle air control valve, IF that early engine has one.

for sure if it has old gas, you want to drain as much as practical and get a full tank of fresh gas, maybe change the fuel filter too. CIS runs at like 80 PSI fuel pressure, so be sure to get new gaskets or seals for anything you take apart.

sadly, I'm mostly familiar with the LH systems of the 80s and 90s. about the only K-Jet I've dug around on was a Mercedes (they used it until 1992).
Related Topics
Thread Starter
Last Post
Volvo 240, 740 & 940
01-21-2019 02:30 PM
Volvo S40
10-31-2017 11:50 AM
Volvo V70
03-25-2016 08:42 PM
Volvo 240, 740 & 940
01-11-2014 05:30 PM
Private Wanted Classifieds
09-04-2010 03:06 PM

Thread Tools
Search this Thread
Quick Reply: New 1975 245 DL Rough Idle and Hesitates

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.